Definition of "achromatic"

(optics) Free from color; transmitting light without color-related distortion.  examples

Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.  examples

(biology) Uncolored; not absorbing color from a fluid; -- said of tissue

(music) Having only the diatonic notes of the scale; not modified by accidentals.  examples

Being achromatic in subject  examples